Data Sheet
October 2, 2009
CPKW002A0C1 Power Module; dc-dc Converter
36 – 75 Vdc Input; 15Vdc 2A Output
Feature Descriptions
(continued)
Output Voltage Set-Point Adjustment
(Optional pin on TH version)
Trimming allows the user to increase or decrease the
output voltage set point of the module. This is
accomplished by connecting an external resistor
between the TRIM pin and either the Vout+ pin or the
Vout- pin.
Vin+
Vout+
ON/OFF
TRIM
R
adj-up
Vin-
Vout-
R
LOAD
Trim Down – Decrease Output Voltage
By connecting an external resistor between the TRIM pin
and Vout+ pin (Radj-down), the output voltage set point
decreases (see figure 11). The following equation
determines the external resistor value to obtain an output
voltage change from Vo, nom to the desired Vo, adj:
Figure 12. Circuit Configuration to Increase Output
Voltage
⎤
⎡
(
V
o
,
adj
−
L
)
×
G
R
adj
−
down
= ⎢
−
H
⎥Ω
⎦
⎣
(
V
o
,
nom
−
V
o
,
adj
)
Note: Values for G, H, L and K are defined for each
module version in the following table 1 .
Module
G
H
5110
K
12.5
L
2.5
CPKW002A0C1 10,000
Table 1 . Trim Constants CPKW002A0C1
The combination of the output voltage adjustment and
the output voltage initial tolerance must not exceed the
allowable trim range of 90% to 110% of the nominal
output voltage as measured between the Vout+ and
Vout- pins.
Vin+
Vout+
R
adj-down
ON/OFF
TRIM
R
LOAD
The CPKW002A0C1 power modules have a fixed
current-limit set point. Therefore, as the output voltage
is adjusted down, the available output power is reduced.
Vin-
Vout-
Trim Examples
For CPKW002A0C1, nominal 15.0V module. To trim
module up to 15.5V (see figure 12):
Figure 11. Circuit Configuration to Decrease Output
Voltage
Trim Up – Increase Output Voltage
By connecting an external resistor between the TRIM pin
and Vout- pin (Radj-up), the output voltage set point
increases (see figure 12). The following equation
determines the external resistor value to obtain an output
voltage change from Vo, nom to the desired Vo, adj:
⎡
(10,000
×
2.5)
⎤
−
5110
⎥ Ω
R
adj
−
up
= ⎢
⎣
(15.5
−
2.5
−
12.5)
⎦
R
adj
−
up
=
44,890
Ω
⎡
⎤
(
G
×
L
)
−
H
⎥Ω
R
adj
−
up
= ⎢
⎣
(
V
o
,
adj
−
L
−
K
)
⎦
Note: Values for G, H, L and K are defined for each
module version in the following table 1 .
LINEAGE
POWER
9
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
